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Search for a Low Mass Particle Decaying intoμ+μ−inB0→K*0XandB0→ρ0Xat Belle

descriptionPublicationkeyboard_double_arrow_right Article , Preprint , Journal 25 Aug 2010 Taiwan Publisher:American Physical Society (APS)Journal:Physical Review Letters, volume 105 (issn: 0031-9007, eissn: 1079-7114, Copyright policy )Funded by:SNSF | Regionale Disparitäten un...
Authors: Bruce Yabsley; Y. Iwasaki; Y. Yamashita; Y. Hoshi; T. Ohshima; Peter Kodys; S. Nishida; +111 Authors

doi: 10.1103/physrevlett.105.091801

pmid: 20868151

arXiv: http://arxiv.org/abs/1005.1450 , 1005.1450

Search for a Low Mass Particle Decaying intoμ+μ−inB0→K*0XandB0→ρ0Xat Belle

Abstract

We search for dimuon decays of a low mass particle in the decays B0→K*0 X and B0→ρ0 X using a data sample of 657×10(6)BB events collected with the Belle detector at the KEKB asymmetric-energy e+ e- collider. We find no evidence for such a particle in the mass range from 212 MeV/c2 to 300 MeV/c2 for lifetimes below 10(-12) s, and set upper limits on its branching fractions. In particular, we search for a particle with a mass of 214.3 MeV/c2 reported by the HyperCP experiment, and obtain upper limits on the products B(B0→K*0 X)×B(X→μ+ μ- )<2.26(2.27)×10(-8) and B(B0→ρ0 X)×B(X→μ+ μ-)<1.73(1.73)×10(-8) at 90% C.L. for a scalar (vector) X particle.

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Keywords

Ions, High Energy Physics - Experiment, Energy Transfer, Models, Chemical, Nanoparticles, Particle Accelerators, Algorithms, Nuclear Physics

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    		 28
    popularity
    This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
    		 Top 10%
    influence
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    		 Top 10%
    impulse
    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
28
Top 10%
Top 10%
Top 10%
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bronze
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